Classifications

• • H—ELECTRICITY
  • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
  • H02K—DYNAMO-ELECTRIC MACHINES
  • H02K1/00—Details of the magnetic circuit
  • H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
  • H02K1/22—Rotating parts of the magnetic circuit
  • H02K1/27—Rotor cores with permanent magnets
  • H02K1/2706—Inner rotors
  • H02K1/272—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis
  • H02K1/274—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets
  • H02K1/2753—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets the rotor consisting of magnets or groups of magnets arranged with alternating polarity
  • H02K1/278—Surface mounted magnets; Inset magnets
• • H—ELECTRICITY
  • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
  • H02K—DYNAMO-ELECTRIC MACHINES
  • H02K1/00—Details of the magnetic circuit
  • H02K1/04—Details of the magnetic circuit characterised by the material used for insulating the magnetic circuit or parts thereof
• • H—ELECTRICITY
  • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
  • H02K—DYNAMO-ELECTRIC MACHINES
  • H02K1/00—Details of the magnetic circuit
  • H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
  • H02K1/22—Rotating parts of the magnetic circuit
  • H02K1/27—Rotor cores with permanent magnets
• • H—ELECTRICITY
  • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
  • H02K—DYNAMO-ELECTRIC MACHINES
  • H02K1/00—Details of the magnetic circuit
  • H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
  • H02K1/22—Rotating parts of the magnetic circuit
  • H02K1/27—Rotor cores with permanent magnets
  • H02K1/2786—Outer rotors
  • H02K1/2787—Outer rotors the magnetisation axis of the magnets being perpendicular to the rotor axis
  • H02K1/2789—Outer rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets
  • H02K1/2791—Surface mounted magnets; Inset magnets
• • H—ELECTRICITY
  • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
  • H02K—DYNAMO-ELECTRIC MACHINES
  • H02K15/00—Processes or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines
  • H02K15/02—Processes or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines of stator or rotor bodies
  • H02K15/03—Processes or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines of stator or rotor bodies having permanent magnets
• • H—ELECTRICITY
  • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
  • H02K—DYNAMO-ELECTRIC MACHINES
  • H02K2213/00—Specific aspects, not otherwise provided for and not covered by codes H02K2201/00 - H02K2211/00
  • H02K2213/12—Machines characterised by the modularity of some components

Definitions

• the present invention relates to a rotor for motor or generator, where the rotor includes a segmented yoke, especially for motors and generators based on permanent magnets, according to the preamble of claim 1.
• Permanent magnet motors have become more and more popular due to their applicability. There is an increasing focus on production costs, manufacturing of mounting-friendly solutions, and the solutions should be more service-friendly, something the present solutions fail to provide. Present solutions also result in that maintenance of motors and generators is complicated and expensive.
• the yoke of a rotor for a motor or generator is usually manufactured as a complete ring, something which increases the costs and complicates the manufacturing, especially related to large motors or generators.
• a yoke By the use of a yoke as one ring one is dependent of machining a large yoke and the number of machines capable of handling this is limited. There is thus a great need for providing solutions which simplify the manufacturing, provide improved production properties, saved costs, simpler assembling of the end-product, and improved service-friendliness.
• Each pole includes one or more permanent magnet pole elements, which pole element is intended for being arranged to the rotor yoke of an electrical machine.
• US 2005/0225192 Al describes a rotor arrangement of an electrical machine which has a rotor body and permanent magnets enclosed in the rotor body.
• the main object of the present invention is to provide a rotor which solves the above- mentioned disadvantages of prior art.
• a rotor for motor or generator according to the invention is described in claim 1. Preferable features of the rotor are described in the remaining claims.
• the present invention describes construction of a rotor based on permanent magnet technology.
• the present invention is especially directed to the use of a rotor with a segmented yoke where the end-product can be either a motor or generator.
• the design and number of yoke segments are adapted to the desired specifications for the rotor.
• the permanent magnets can be produced separately and then be arranged on the yoke segments, preferably as magnet blanks, which means that several permanent magnets are arranged to each other prior to arrangement to the yoke segment.
• the number of permanent magnets in each magnet blank and on each yoke segment is adapted to the desired specifications for the rotor.
• the yoke segment itself can be formed by steel, a material satisfying the electrical design or similar, or the yoke segment can e.g. be formed by laminated sheet metal of the same type sheet metal as stator for the motor or rotor is made of.
• laminated sheet material One advantage with using laminated sheet material is that one then reduces the loss in the rotor, i.e. loss generated by eddy currents, and that hysteresis is reduced.
• Laminated sheet material which forms a yoke segment may be arranged in radial or axial direction.
• the rotor ring can e.g. be the propeller tube of a thruster, winch, steering engine, azimuth thruster or similar.
• the magnet blanks can be arranged prior to or after the yoke segments are assembled to form a complete yoke.
• a yoke of a rotor is usually made as a complete ring, which in many cases make the
• Another advantage with the present invention is that maintenance of a motor or generator which includes a rotor according to the invention is that the magnets easily can be exchanged if they are damaged.
• magnet blanks including permanent magnets are arranged to each segment, of which the number of North and South magnets can vary.
• Several permanent magnets can be glued together for forming magnet blanks prior to arrangement to the yoke segment.
• the magnet blanks can be arranged to the yoke segment and corrosion-protected in different ways.
• One way is that the magnet blanks are arranged in a suitable encapsulation which is adapted for arrangement to the yoke segment.
• Another alternative is that the magnet blanks are arranged directly to the yoke segment by means of gluing, in force of the magnetic force of the permanent magnets or similar, after which the permanent magnets are encapsulated while they are arranged to the yoke segment.
• a third alternative is that magnet blanks already being encapsulated are glued to the yoke segment.
• a fourth alternative is that the magnet blanks are arranged to a carrier which is adapted for being arranged to the yoke segment and that an encapsulation is adapted to the yoke segment after arrangement of the magnet blanks.
• Other suitable variants can also be used.
• the encapsulations can be of several types, such as a suitable material which applied to the permanent magnets prior to or after they are arranged to the yoke segment, or as a separate encapsulation of e.g. stainless steel, composite, glass fiber, elastomer or similar.
• a suitable material which applied to the permanent magnets prior to or after they are arranged to the yoke segment
• a separate encapsulation e.g. stainless steel, composite, glass fiber, elastomer or similar.
• sealing of the encapsulation it can be adapted a gasket or sealing means between the encapsulation and the yoke segment or that the encapsulation is applied sealing means after arrangement.
• both the yoke segment and the magnets can be encapsulated together in a suitable material, e.g. composite material, glass fiber, elastomer or similar.
• the permanent magnets are preferably demagnetized in connection with the arrangement to the yoke segment, but can also be magnetized dependent of desired arrangement method.
• the yoke segment can e.g. include three magnet blanks each including four permanent magnets.
• the yoke segment preferably has a design which is adapted to the complete yoke with magnet blanks forming a rotor with an accurate outer or inner circumference. Further preferable features and advantages will appear from the following example description. Example
• Figure 1 is a perspective drawing of a rotor according to the invention
• Figures 2a-b show different sections of the rotor in Figure 1
• Figures 3a-c show details of a yoke segment
• FIG. 4 shows details of permanent magnets
• Figure 5 shows an example of encapsulation of yoke segments
• Figures 6a and 6b show examples of yoke segments formed by laminated sheet material.
• FIG. 1 shows a rotor 11 for a motor or generator according to the invention.
• the rotor 11 includes a rotor ring 12, e.g. in the form of a propeller tube for a thruster, which is an application the present invention is applicable for.
• the rotor 11 according to the present invention further includes a yoke formed by yoke segments 13 which are arranged to the rotor ring 12 by means of suitable fastening means 14, such as bolts.
• the rotor ring 12 is preferably provided with a protruding part 15 which extends centrally with a given width and height along the entire circumference of the rotor ring 12.
• the protruding part 15 includes fastening means 16, such as threaded holes, adapted to the fastening means 14 for securing the yoke segments 13 to the rotor ring 12.
• Each yoke segment 13 is further provided with one or more one or more guiding pins 17 (shown in Figure 2b), in the example only one guiding pin is shown, and the rotor ring 12 is provided with one or more holes for a guiding pin 17, or vice versa, which guiding pin(s) 17 and hole(s) are used for positioning the yoke segments 13 in relation to the rotor ring 12 and in relation to each other.
• guiding pin(s) 17 and hole(s) are used for positioning the yoke segments 13 in relation to the rotor ring 12 and in relation to each other.
• FIGS 3a-c show details of a yoke segment 13 provided with permanent magnets 18.
• the permanent magnets 18 are preferably arranged in magnet blanks 19, in the example three magnet blanks 19 for each yoke segment 13, where each magnet blank 19 consists of four permanent magnets 18, where the number of North and South magnets can vary, arranged in longitudinal direction of the yoke segment 13.
• 19/permanent magnets 18 on each yoke segment 13 can vary and is dependent on the desired specifications for the rotor 11.
• the yoke segments 13 has a design which is adapted so that when all the yoke segments 13 are arranged to the rotor ring 12, the end-product will have a ring with accurate outer circumference. If it is an outer rotor, the yoke segments will be arranged on the inside of the rotor ring 12 and thus form an accurate inner circumference.
• the yoke segments 13 are assembled, i.e. provided with permanent magnets 18, the yoke segments 13 are arranged to the rotor ring 12 by means of the suitable fastening means 14.
• the fastening means for arrangement of the yoke segments 13 to the rotor ring 12 are arranged so that they are positioned outside the permanent magnets and in this way will not reduce the effect of the permanent magnets.
• the yoke segments 13 are preferably arranged with their longitudinal direction in transversal direction of the rotor ring 12, but the opposite is also a possible solution. It will also be possible to arrange the magnet blanks 19/permanent magnets 18 to the yoke segments 13 after the yoke segments 13 are assembled to form a complete yoke, i.e. arranged to the rotor ring 12.
• the above-mentioned magnet blanks 19 are preferably formed by that the permanent magnets
• the magnet blanks 19 can be arranged to the yoke segments 13 in several ways. One way is to arrange the magnet blanks 19 directly to the yoke segments 13 by gluing, magnetic force or similar. The magnet blanks 19 are further preferably enclosed in a material protecting the permanent magnets 18 against corrosion. An alternative to this will e.g. be to arrange a suitable encapsulation to the magnet blanks 19 after the magnet blanks 19 are arranged to the yoke segment 13. The magnet blanks 19 can also be arranged in a suitable encapsulation prior to they are arranged to the yoke segment 13. Another alternative is that the magnet blanks
• the encapsulations can be of several types, such as a suitable material which is applied on the magnet blanks 19 prior to or after they are arranged to the yoke segment 13, or as a separate encapsulation of stainless steel, composite material, glass fiber, elastomer or similar.
• a separate encapsulation it is preferably arranged a gasket or sealing means between the encapsulation and the yoke segment 13, or that the encapsulation is applied sealing means after the arrangement to make it completely sealed.
• Another variant can be welding of the joint between the encapsulation and the yoke segment 13. If welding is used it is an advantage that the permanent magnets 18 are demagnetized during the welding so that the permanent magnets are not damaged by the heat during this process.
• FIG. 5 it is shown a solution where both the yoke segment 13 and magnet blanks 19 are encapsulated in a suitable material, e.g. glass fiber, elastomer, composite or similar, such that the yoke segment 13 and magnet blanks 19 constitute an encapsulated unit 50 which is adapted for arrangement to the rotor ring 12.
• a suitable material e.g. glass fiber, elastomer, composite or similar
• the yoke segments 13 are further specially shaped so that they by arrangement to the rotor ring 12 forms a complete yoke.
• the yoke segments 13 are for this e.g. shaped with a mainly planar base 20 which at its ends has upwards extending sides 21a-b which extend slightly inclined outwards from the base 20 towards an upper surface 22, which has some longer extension than the base 20.
• the upper surface 22 has a planar central section 22a which extends in parallel with the base 20, and slightly inclined surfaces 22b-c at each side of the central section 22a inclined down towards the sides 21a-b.
• the yoke segments 13 will be arranged close to adjacent yoke segments 13 and when the rotor ring 12 is covered by yoke segments 13 along its circumference form a complete yoke with permanent magnets 18 on the rotor ring 12 which has an accurate outer circumference for an inner rotor.
• the yoke segments 13 are preferably arranged with their longitudinal direction in transversal of the rotor ring 12 and preferably have a size in the longitudinal direction which corresponds to the width of the protruding part 15 of the rotor ring 12.
• the yoke segments 13 further has a thickness which is adapted so that the magnet blanks 19 arranged on the yoke segments 13 form a part of the outer circumference of the rotor.
• the yoke segments will thus ensure that there are similar distances between the magnet blanks after assembly.
• the distance between the magnet blanks will of course be dependent of design and end- product, but the fact that there is a distance between the magnet blanks, i.e. the magnets, will make it easier to magnetize the magnets after they are arranged, as this distance will make it possible to control the magnetizing pulse correctly. In other words will this distance ensure that one do not get unwanted N-S magnet conflict in connection with magnetizing.
• the yoke segment can also be formed by plates 61 of laminated steel material, i.e. the same type steel material as the stator is formed of, which are glued together and heat cured to provide a solid construction.
• the use of laminated sheet material will reduce the loss in the rotor, i.e. loss generated by eddy currents, and reduction of hysteresis.
• Figure 6a it is shown a solution where plates 61 of laminated sheet material extend in transversal direction of the yoke segment 13.
• the rotor ring can be provided with planar or curved sections where the yoke segments are to be arranged for easier arrangement.
• the yoke segments can be provided with a base which is adapted to the outer circumference of the rotor ring so that they by arrangement to the rotor ring are positioned against the rotor ring, e.g. curved so that they follow the profile of the rotor ring.
• the rotor ring can also be divided in sections which are assembled to form a complete rotor ring.
• the segments are preferably then adapted so that they can be arranged to rotor ring segments and that the rotor ring segments with yoke segments are finally assembled to form a complete rotor for motor or generator.

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• Engineering & Computer Science (AREA)
• Power Engineering (AREA)
• Manufacturing & Machinery (AREA)
• Permanent Field Magnets Of Synchronous Machinery (AREA)

Priority Applications (7)

Applications Claiming Priority (2)

Publications (1)

Family

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Family Applications (1)

Country Status (9)

Families Citing this family (9)

Citations (7)

Family Cites Families (17)

• 2012
  • 2012-03-26 NO NO20120365A patent/NO333881B1/no unknown
• 2013
  • 2013-03-22 WO PCT/NO2013/050059 patent/WO2013147615A1/en active Application Filing
  • 2013-03-22 US US14/386,379 patent/US10468925B2/en active Active
  • 2013-03-22 EP EP13768444.5A patent/EP2831979B1/en active Active
  • 2013-03-22 PL PL13768444T patent/PL2831979T3/pl unknown
  • 2013-03-22 ES ES13768444T patent/ES2769501T3/es active Active
  • 2013-03-22 KR KR1020147021697A patent/KR102269299B1/ko active Active
  • 2013-03-22 BR BR112014022516A patent/BR112014022516A8/pt not_active Application Discontinuation
  • 2013-03-22 DK DK13768444.5T patent/DK2831979T3/da active

Patent Citations (7)

Non-Patent Citations (1)

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